1217880 has 96 divisors (see below), whose sum is σ = 4212000. Its totient is φ = 304128.

The previous prime is 1217861. The next prime is 1217893. The reversal of 1217880 is 887121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6021 + ... + 6219.

It is an arithmetic number, because the mean of its divisors is an integer number (43875).

2^1217880 is an apocalyptic number.

1217880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106000).

1217880 is an abundant number, since it is smaller than the sum of its proper divisors (2994120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1217880 is a wasteful number, since it uses less digits than its factorization.

1217880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1217880 is about 1103.5760055384. The cubic root of 1217880 is about 106.7910441508.

It can be divided in two parts, 121 and 7880, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 1217880 in words is "one million, two hundred seventeen thousand, eight hundred eighty".